I have the Newind board and it's a nice piece of gear. It doesn't feel any different than a one-piece board when you're riding it and I don't feel like I have to go easy on it when jumping, etc. It is only a coulple of ounces heavier than my Underground FLX of roughly the same size. It wasn't cheap, but I use it only when I travel so I'm expecting it to last as long as I can still kite. I figure it saves me $200-$400 per year in luggage costs (depending on how much I travel), so it will pay for itself in 4-5 years.
If anyone is buying the Newind board, you can order any length and width you want, and I even specified the stance width (good to do, becase there's only one set of mounting holes). I found that the tips are much wider than my Underground, so be aware that it could have more volume than you're used to even if you order the same size as another board you have.
I've had 2 trips with it now and I'm very happy with my purchase.
Trod, for good info in english, see http://xtremebigair.com/Newind-Split-KiteBoard-P1069.aspx
If you're in the US, order it thru them, Kinsely made the process easier and you're helping out a kiter who's had a rough go in the last few years (search the forum for Kinsley Thomas Wong).
Also see the recent thread for the Flyboard and Nobile split boards soon to be released.